xcode+cmake: use SDL3.framework folder as IMPORTED_LOCATION

[ci skip]

Xcode/SDL/pkg-support/share/cmake/SDL3/SDL3Config.cmake

@@ -112,7 +112,7 @@ if(NOT TARGET SDL3::SDL3-shared)
         set_target_properties(SDL3::SDL3-shared
             PROPERTIES
                 FRAMEWORK "TRUE"
-                IMPORTED_LOCATION "${_sdl3_framework_path}/SDL3"
+                IMPORTED_LOCATION "${_sdl3_framework_path}"
                 INTERFACE_LINK_LIBRARIES "SDL3::Headers"
         )
     endif()